Wi-Fi Calling services use a broadband internet connection to make calls, including 911 calls. Calls to 911 using Wi-Fi Calling operate differently than 911 calls made over a cellular network or a landline phone. If possible, use a cellular connection or a landline phone to place any 911 calls. When you a place a 911 call, even if you have Wi-Fi Calling services enabled, if a cellular connection is available, your handset should attempt to place the 911 call over the handset’s native dialer using a cellular connection to improve call quality and location accuracy for emergency services. However, when you first enable Wi-Fi Calling on T-Mobile, you must provide us with the primary street address at which the Wi-Fi Calling service will be used (“Your E911 Registered Address”). If you call 911 over Wi-Fi, we may transmit Your E911 Registered Address to the 911 Communications Center that answers the call and it may be used to help emergency responders locate you. However, because of the limitations associated with Wi-Fi 911 calling, including the fact that the broadband internet connection utilized may be supplied by a third-party unaffiliated with T-Mobile, you should be ready to provide the 911 Communications Center with your contact information and current location when calling 911. You agree to update Your E911 Registered Address if you plan on using the Wi-Fi Calling service at a location different from Your E911 Registered Address. You can update Your E911 Registered Address by accessing your MyT-Mobile.com account or by contacting T-Mobile Customer Care.